7947878389 has 8 divisors (see below), whose sum is σ = 8671057920. Its totient is φ = 7224806400.

The previous prime is 7947878387. The next prime is 7947878401. The reversal of 7947878389 is 9838787497.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7947878389 - 2¹ = 7947878387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7947878387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282229 + ... + 309109.

It is an arithmetic number, because the mean of its divisors is an integer number (1083882240).

Almost surely, 2^7947878389 is an apocalyptic number.

It is an amenable number.

7947878389 is a deficient number, since it is larger than the sum of its proper divisors (723179531).

7947878389 is a wasteful number, since it uses less digits than its factorization.

7947878389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53771.

The product of its digits is 170698752, while the sum is 70.

The square root of 7947878389 is about 89150.8743030600. The cubic root of 7947878389 is about 1995.6470652696.

The spelling of 7947878389 in words is "seven billion, nine hundred forty-seven million, eight hundred seventy-eight thousand, three hundred eighty-nine".